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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-02-09 16:26:55 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-02-10 23:20:45 -0800 |
| commit | 1e19e02ca0c5e33ea73a25127dbe6c3b8fcaac4b (patch) | |
| tree | 23afba2945a9e09b137b094a868ea176c1e1c800 /include/net | |
| parent | 0c195c3fc4e95a06b0c0017506f074c94af99c35 (diff) | |
| download | linux-1e19e02ca0c5e33ea73a25127dbe6c3b8fcaac4b.tar.gz linux-1e19e02ca0c5e33ea73a25127dbe6c3b8fcaac4b.tar.bz2 linux-1e19e02ca0c5e33ea73a25127dbe6c3b8fcaac4b.zip | |
[NET]: Reorder fields of struct dst_entry
This last patch (but not least :) ) finally moves the next pointer at
the end of struct dst_entry. This permits to perform route cache
lookups with a minimal cost of one cache line per entry, instead of
two.
Both 32bits and 64bits platforms benefit from this new layout.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/dst.h | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/include/net/dst.h b/include/net/dst.h index 5d62342e8bc4..e12a8ce0b9b3 100644 --- a/include/net/dst.h +++ b/include/net/dst.h @@ -37,14 +37,7 @@ struct sk_buff; struct dst_entry { - union { - struct dst_entry *next; - struct rtable *rt_next; - struct rt6_info *rt6_next; - struct dn_route *dn_next; - }; - atomic_t __refcnt; /* client references */ - int __use; + struct rcu_head rcu_head; struct dst_entry *child; struct net_device *dev; short error; @@ -55,7 +48,6 @@ struct dst_entry #define DST_NOPOLICY 4 #define DST_NOHASH 8 #define DST_BALANCED 0x10 - unsigned long lastuse; unsigned long expires; unsigned short header_len; /* more space at head required */ @@ -80,8 +72,16 @@ struct dst_entry #endif struct dst_ops *ops; - struct rcu_head rcu_head; + unsigned long lastuse; + atomic_t __refcnt; /* client references */ + int __use; + union { + struct dst_entry *next; + struct rtable *rt_next; + struct rt6_info *rt6_next; + struct dn_route *dn_next; + }; char info[0]; }; |